diff --git a/attn/attn_logging.hpp b/attn/attn_logging.hpp
index 7e89555..4f1f785 100644
--- a/attn/attn_logging.hpp
+++ b/attn/attn_logging.hpp
@@ -17,7 +17,8 @@
 /** @brief Logging level types */
 enum level
 {
-    INFO
+    INFO,
+    ERROR
 };
 
 /** @brief Logging event types */